What is CVE-2021-46977?

CVE-2021-46977 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.5 onward and patched in 5.10.38, 5.11.22, 5.12.5 and others. CVE-2021-46977 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-46977?

CVE-2021-46977 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-46977?

Yes, CVE-2021-46977 has been patched. Fixed versions include 5.10.38, 5.11.22, 5.12.5 and others. If you are running Linux kernel 5.5 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-46977 actively exploited?

CVE-2021-46977 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-46977

Medium

In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Disable preemption when probing user return MSRs Disable preemption when probing a user return MSR via RDSMR/WRMSR. If the MSR holds a different value per logical CPU, the WRMSR could corrupt the host's value if KVM is preempted between the RDMSR and WRMSR, and then rescheduled on a different CPU. Opportunistically land the helper in common x86, SVM will use the helper in a future commit.

Package Linux Kernel

Published 2024-02-28

Last modified 2025-01-08

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 5.5 and later are affected. Fixed in 5.10.38, 5.11.22, 5.12.5, 5.13 and their respective stable series.

Affected from

≥ 5.5

Fixed in

✓ 5.10.38 5.10.x ✓ 5.11.22 5.11.x ✓ 5.12.5 5.12.x ✓ 5.13

References

4 total

Kernel Git
https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089

Patch
Kernel Git
https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890

Patch
Kernel Git
https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94

Patch
Kernel Git
https://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed

Patch

Details

CVE ID CVE-2021-46977

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-02-28

Modified 2025-01-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-46977?

CVE-2021-46977 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.5 onward and has been patched in 5.10.38, 5.11.22, 5.12.5 and others. CVE-2021-46977 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-46977?

CVE-2021-46977 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-46977?

Yes. CVE-2021-46977 has been patched. Fixed versions include 5.10.38, 5.11.22, 5.12.5 and others. If you are running Linux kernel 5.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-46977 actively exploited?

No. CVE-2021-46977 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.